Fix sun rendering in IE11.

IE11 doesn't yet support TRIANGLE_FAN.
Update CHANGES.md.
Merge branch 'master' into ie11Sun
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Fix documentation.
Fixes sampleTerrain with STK World Terrain on Firefox.
Documentation fixes.
Make sampleTerrain wait for the terrainProvider to be ready.
Update CHANGES.md.
Merge pull request #1743 from AnalyticalGraphicsInc/fixDoc

Minor documentation fixes.
Merge pull request #1744 from AnalyticalGraphicsInc/issue1739

Fix two sampleTerrain problems
Merge pull request #1741 from AnalyticalGraphicsInc/ie11Sun

Fix Sun rendering in IE11
Merge master to dojo-1.9.3